Improved joint for pitman-heads, sickles of harvesters



V.the two remaining sides ,prevent the wrist "further into the seat, and thus it cannot be tightened dimitri tattt @wat @titille IVA POFFENBERGER, OF OHAMPAIGN COUNTY, OHIO.

Leners Pam: No.1o2,151, dated Apm 19, 1870. v

The Schedule referred to in these Lettere Patent and making part of the same.

Ta all whomyit may concern:

Be it known that I, IVA Porrnxnnncnn, of the county of Champaign and State of Ohio, have invented certain Improvements in Joints for Pitman-Heads and Sickles of Harvesters, &c., of which the following is a specification, reference being had to the accompanying drawings.

In harvester pitinans, as heretofore constructed, the wrists have been made of either a cylindrical or a conical form, and arranged to work in a correspondingly-shaped hole or seat in'the sickle-head, but when of either form, as the. wrist and its seat wore away, the wrist became loose, and rattled back and forth within the seat, greatly to the injury of the driving mechanism and the annoyance oi' the operator.

As a result of the peculiar man, this wear is almost entirely upon the front and rear sides of the wrist and its seat, and thus the seat is elongated horizontally and the wrist flattened, while both remainof vnearly the original diameter vertically. When the cylindrical wrist was used, this wear could only be compensated for by bushing or renewing the parts, but when the taper or conical wrist was adopted,

it was supposed that the joint could be tightened and play prevented by setting the wrist further into its seat. In practice, however, it has been found that, as the wrist and seat wear only upon the two sides, entering so as to prevent longitudinal play.

My invention has for its object to produce a joint which may always be kept tight, so as not to play or rattle and It consists in providing a taper-wrist, iiatteued upon its upper and lower sides, and inserting it into a conical seat; and also in providing the' pitman with a spring and set-screw, by which'the wrist is held firmly to itsgseat.

In the drawings- Figure l is a side elevation of .my joint;

Figure 2, a section of the same on the line :u a: of

Figure 3 is a. longitudinal Ivertical section of the same on the line y y of lig. 2; and

Figures 4 and 5 are views o'f the old style of wrist, showing the peculiar manner in which they wear away;

A is the sickle-head, made inthe usual manner, i

movement of the pitand provided with a conical hole or seat, a, entering from one side, and extending nearly through it.

B is the. pitman, having its end bent or off-set, and the wrist O formed upon it, as shown.

The wrist G I make of a'size and taper. corresponding to theseat a, and cut away or flatten its upper and lower sides, as shown at d d, figs. 2 and 3, vand theninsert it within the seat, as shown in fig. 2.

Tothe side of the pitman I secure a spring-arm,

D, and through the end of this arm, in line with the axis of the wrist, I pass a screw, E, which `bears against or in the back side .of the head A, as shown in figs. 1 and 2, so as to hold the wrist snugly to its place.-

The screw E I provide with a lock-nut, b, by which it is prevented from jarring loose or unscrewing as the pitman vibrateS.

In using my joint, I turn the screw E until it 'causes a slight tension upon thespring arm, and then turn up the lock or janib nut to hold it, so that, as

the wrist and seat wear by action, the spring-arm will draw the wrist deeper into the seat, so as to lit snugly, and thus prevent play or rattle of the parts.

Instead of iiattening the wrist, it is obvious that the' same result may be produced by making the wrist conical, and the seat of a corresponding taper, but

elongated vertically, or, in other words, of an ellipti cal forni in cross section, the principle and mode of operation being the same.

By this method of construction it will be seen that, as the front and rear sides of the wrist or of the hole wear away, the wristcan be shoved in far enough to give a bearing at front and rear without binding at top and bottom, as otherwise would be the case.

Having thus described my invention,

What I claim isl. A pitman-joint, consisting of a conical hole, with a correspondingly conical wrist, flattened at its sides, substantially as described.

2. In combination with the joint above described,

the spring arm D, attached to the pitman, and pro'- vided with the set-screw E, substantially as set forth.

IVA POFFENBERGER.

Witnesses Tnos. H. HUMPHREYS, MICHAEL GALLIGHER. 

